I need they are selling is this OK to buy for my doorbell ?to buy a 1 Amp Diode for my doorbell ringer an the one I see to buy says it a Rectifier type of Diode

Wow, this just does not make any sense at all.

A rectifier is an electronic device that allows current to flow in one direction only. It takes 4 rectifiers to build a Rectifier Bridge and converts a full sine wave of AC to a pulsing DC circuit. And then it take a set of capacitors to then flatten the AC bounce out and effectively make usable DC Voltage.

A door bell is about the simplist electrical circuit in the world. It takes a door button (switch), the bell unit and usually a 120v AC to 24v AC for the entire process.

The voltage from a 120 volt branch circuit feeds the transformer. The transformer steps the voltage down to 24 volts and feeds the switch. The switch when closed feeds the bell unit.

Putting a rectifier in would make no sense. A rectifier cannot change the voltage level of the incoming signal to anything but a pulse. It certainly cannot drop the signal from 120 volts to 24 volts. A single rectifier all by its self would only get you 1/4 of the incoming signal of which only the peak part of the signal would be usable.